Household Energy Calculator

Household Energy is evaluated from Monthly Electricity, Monthly Natural Gas and Annual Heating Oil. The calculation reports Total Annual Energy, Total Annual CO₂ Emissions and Estimated Annual Energy Cost.

Results

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About the Household Energy Calculator

Household Energy is treated here as a quantitative relation between Monthly Electricity, Monthly Natural Gas, Annual Heating Oil and Annual Propane and Total Annual Energy, Total Annual CO₂ Emissions, Estimated Annual Energy Cost and vs. US Average Home.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
CO₂ from EPA emission factors for each fuel type
Cost estimates based on US average prices: electricity $0.14/kWh, gas $1.30/therm, oil $4.00/gal, propane $2.50/gal

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

CO₂ from EPA emission factors for each fuel type
Cost estimates based on US average prices: electricity $0.14/kWh, gas $1.30/therm, oil $4.00/gal, propane $2.50/gal

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: Average US home: 886 kWh/mo electric, 50 therms/mo gas

Inputs

electricity_kwh: 886 natural_gas_therms: 50 heating_oil_gal: 0 propane_gal: 0
Total Annual Energy: 96.3 MMBtu/yr. Total Annual CO₂ Emissions: 7.28 metric tons. Estimated Annual Energy Cost: $2,268. vs. US Average Home: 19.3 MMBtu above US average

With Monthly Electricity = 886, Monthly Natural Gas = 50, Annual Heating Oil = 0 and Annual Propane = 0 as the stated inputs, the result is Total Annual Energy = 96.3 MMBtu/yr, Total Annual CO₂ Emissions = 7.28 metric tons and Estimated Annual Energy Cost = $2,268. Each value corresponds to the declared output fields.

Example 2: Cold-climate home with heating oil: 700 kWh/mo electric, 700 gallons heating oil/yr

Inputs

electricity_kwh: 700 natural_gas_therms: 0 heating_oil_gal: 700 propane_gal: 0
Total Annual Energy: 125.3 MMBtu/yr. Total Annual CO₂ Emissions: 10.35 metric tons. Estimated Annual Energy Cost: $3,976. vs. US Average Home: 48.3 MMBtu above US average

With Monthly Electricity = 700, Monthly Natural Gas = 0, Annual Heating Oil = 700 and Annual Propane = 0 as the stated inputs, the result is Total Annual Energy = 125.3 MMBtu/yr, Total Annual CO₂ Emissions = 10.35 metric tons and Estimated Annual Energy Cost = $3,976. Each value corresponds to the declared output fields.

Example 3: High-efficiency new construction: 400 kWh/mo electric only, all-electric

Inputs

electricity_kwh: 400 natural_gas_therms: 0 heating_oil_gal: 0 propane_gal: 0
Total Annual Energy: 16.4 MMBtu/yr. Total Annual CO₂ Emissions: 1.85 metric tons. Estimated Annual Energy Cost: $672. vs. US Average Home: 60.6 MMBtu below US average

With Monthly Electricity = 400, Monthly Natural Gas = 0, Annual Heating Oil = 0 and Annual Propane = 0 as the stated inputs, the result is Total Annual Energy = 16.4 MMBtu/yr, Total Annual CO₂ Emissions = 1.85 metric tons and Estimated Annual Energy Cost = $672. Each value corresponds to the declared output fields.

Example 4: Rural propane home: 600 kWh/mo electric, 400 gallons propane/yr

Inputs

electricity_kwh: 600 natural_gas_therms: 0 heating_oil_gal: 0 propane_gal: 400
Total Annual Energy: 61.1 MMBtu/yr. Total Annual CO₂ Emissions: 5.07 metric tons. Estimated Annual Energy Cost: $2,008. vs. US Average Home: 15.9 MMBtu below US average

With Monthly Electricity = 600, Monthly Natural Gas = 0, Annual Heating Oil = 0 and Annual Propane = 400 as the stated inputs, the result is Total Annual Energy = 61.1 MMBtu/yr, Total Annual CO₂ Emissions = 5.07 metric tons and Estimated Annual Energy Cost = $2,008. Each value corresponds to the declared output fields.

Common Use Cases

  • Calculate total household energy consumption in BTUs or kWh
  • Estimate annual CO2 emissions from home energy use
  • Identify highest energy cost in the home